In my day, if I didn't like a present, I would have been forced to write a thank you note to the giver but then -allowed- to exchange it for something else. Barring the possibility of exchange, it would have been cast to the corner of my closet or given to charity. My mother would NEVER have allowed me to say anything, but rather, would have made a point next year to tell my aunts (the one was notoriously BAD at gift-choices) what my particular tastes were and help out with a few suggestions...

As a child (and subsequently now as an adult) I had/have ZERO sense of entitlement when it comes to gifts. By the very nature of gift giving, you take what you receive, and you do so graciously. Period.